Although you can get Click sockets designed for lighting, also the old British 5 amp there seems to be no real standard for lighting.
Also British law requires 13A plugs to be fitted to portable equipment, so to sell without a plug not easy.
My mother had a new kitchen fitted because she was stuck in a wheel chair, under cupboard lights and extractor over hob lights were included, only bit they missed was ceiling light, they forgot it was pre 1966 so had a problem finding a class II lamp, I had to get this for them.
However we never used those lights, only the ceiling lamp was ever used. Had the under cupboard lights been switched with the main light maybe they would have been used? The lights were supplied from a switched FCU so if the lights you show were used, then simple to swap a FCU for socket.
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